The consensus here on Fanmail is that his TTM items are real. I personally think they look a bit off from the IPs I've seen, but you never know.
Top-10 Favorite Autographs: Al Pacino, Robert De Niro, Tom Hanks, Denzel Washington, Johnny Depp, Steven Spielberg, Martin Scorsese, Larry David, Gary Oldman and Sir Anthony Hopkins.
I'm pretty sure it's authentic. I received one of these myself a few weeks ago, and I compared it for a while to some IPs. I'm pretty certain they're real I'd suggest maybe e-mailing his agency to ask?
R.I.P Jeremy Brett, The Only Sherlock Holmes I've Ever Known.